Armed pro-Russian militants board a truck in the eastern Ukrainian city of Donetsk on May 6, 2014. Pic: AFP

A group of about 30 rebels ambushed the Ukrainian soldiers 20 km north of the embattled Kramatorsk town. Following the attack around 1 p.m., several vehicles of the Ukrainian army were torched, Xinhua quoted the ministry as saying.

All the injured servicemen were rushed to hospital with one of them in critical condition.